Volume growth in the component of fibered twists

For a Liouville domain $W$ whose boundary admits a periodic Reeb flow, we can consider the connected component $[\tau ]\in {\pi }_0({\text{Symp}}^c(\widehat{W}))$ of fibered twists. In this paper, we investigate an entropy-type invariant, called the slow volume growth, of the component $[\tau ]$ and give a uniform lower bound of the growth using wrapped Floer homology. We also show that $[\tau ]$ has infinite order in ${\pi }_0({\text{Symp}}^c(\widehat{W}))$ if there is an admissible Lagrangian $L$ in $W$ whose wrapped Floer homology is infinite dimensional. We apply our results to fibered twists coming from the Milnor fibers of $A_k$-type singularities and complements of a symplectic hypersurface in a real symplectic manifold. They admit so-called real Lagrangians, and we can explicitly compute wrapped Floer homology groups using a version of Morse-Bott spectral sequences.